public ActionResult Index()
{
string Url = "https://accounts.google.com/o/oauth2/auth?scope={0}&redirect_uri={1}&response_type={2}&client_id={3}&state={4}";
// UrlEncode 之後再額外用 + 取代 %20 ->空格
string scope = Utitity.UrlEncode("https://www.googleapis.com/auth/userinfo.profile https://www.googleapis.com/auth/userinfo.email").Replace("%20", "+");
string redirect_uri_encode = Utitity.UrlEncode(redirect_uri);
string response_type = "code";
string state = "";
return(Redirect(string.Format(Url, scope, redirect_uri_encode, response_type, client_id, state)));
}
public ActionResult Index()
{
// 可在額外加入 approval_prompt=force 參數，
// 就不會授權過還會在出現授權畫面
string Url = "https://accounts.google.com/o/oauth2/auth?scope={0}&redirect_uri={1}&response_type={2}&client_id={3}&state={4}";
// https://www.googleapis.com/auth/calendar
// https://www.googleapis.com/auth/calendar.readonly
// 這兩個是存取 Google Calendar 的 scope 中間用空白做分隔
// UrlEncode 之後再額外用 + 取代 %20
string scope = Utitity.UrlEncode("https://www.googleapis.com/auth/calendar https://www.googleapis.com/auth/calendar.readonly").Replace("%20", "+");
string redirect_uri_encode = Utitity.UrlEncode(redirect_uri);
string response_type = "code";
string state = "";
Response.Redirect(string.Format(Url, scope, redirect_uri_encode, response_type, client_id, state));
return(null);
}
public ActionResult CallBack(string Code)
{
// 沒有接收到參數
if (string.IsNullOrEmpty(Code))
{
return(Content("沒有收到 Code"));
}
string Url = "https://accounts.google.com/o/oauth2/token";
string grant_type = "authorization_code";
string redirect_uri_encode = Utitity.UrlEncode(redirect_uri);
string data = "code={0}&client_id={1}&client_secret={2}&redirect_uri={3}&grant_type={4}";
HttpWebRequest request = HttpWebRequest.Create(Url) as HttpWebRequest;
string result = null;
request.Method = "POST"; // 方法
request.KeepAlive = true; //是否保持連線
request.ContentType = "application/x-www-form-urlencoded";
string param = string.Format(data, Code, client_id, client_secret, redirect_uri_encode, grant_type);
byte[] bs = Encoding.ASCII.GetBytes(param);
using (Stream reqStream = request.GetRequestStream())
{
reqStream.Write(bs, 0, bs.Length);
}
using (WebResponse response = request.GetResponse())
{
StreamReader sr = new StreamReader(response.GetResponseStream());
result = sr.ReadToEnd();
sr.Close();
}
TokenData tokenData = JsonConvert.DeserializeObject <TokenData>(result);
Session["token"] = tokenData.access_token;
// 這邊不建議直接把 Token 當做參數傳給 CallAPI 可以避免 Token 洩漏
return(RedirectToAction("CallAPI"));
}